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English definition of “quash”

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quash

verb [T] uk   /kwɒʃ/ us    /kwɑːʃ/

quash verb [T] (REFUSE)

to say officially that something, especially an earlier official decision, is no longer to be accepted: His conviction was quashed in March 1986 after his counsel argued that the police evidence was all lies.

quash verb [T] (STOP)

to forcefully stop something that you do not want to happen: The revolt was swiftly quashed by government troops. The company moved quickly to quash rumours/speculation that it is losing money.
(Definition of quash from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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